Biological Oxygen demand (BOD) is used as a standard measure of

Options :
  1. Oxygen level in forest System
  2. Oxygen level in animals
  3. Oxygen level in water system
  4. Oxygen level in atmosphere
Answer and Explanation :-

Answer: Option 3

Explanation:

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Herein lies the supreme wisdom, human and divine and the task of philosophy consists in teaching men to submit joyously to Necessity which hears nothing and is indifferent to all.
-Lev Shestov Athens and Jerusalem